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Wave length range of visible spectrum extends from 400 nm to 750 nm. The frequency of U.V rays will be ___ $s^{- 1}$

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$5 \times 10^{14}$

$3 \times 10^{12}$

$1.5 \times 10^{15}$

$2 \times 10^{13}$

answer is C.

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Detailed Solution

$γ = \frac{c}{λ}$

range is $\frac{2.998 \times 10^{8} {ms}^{- 1}}{400 \times 10^{- 9} m}$ to $\frac{2.998 \times 10^{8} {ms}^{- 1}}{750 \times 10^{- 9} m}$

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